Door lock



I May 15, 1945 H. VOIGHT EI'AL DOOR LOCK 2 Sheets-Sheet 1 Filed June25, 1943 inner face of the strike member 22, and it will I be apparent that an opening movement of the door will also tend to rotate the bolt and thus permit it to be released from the strike member.

To yieldably hold the bolt against rotation, we provide, upon the rear face of the stem or body portion l6, V-shaped recesses 24, these recesses being as shown disposed substantially 90 from each other. Slidably mounted in the lock case is a detent member having upon the forward end thereof a pair of V-shaped detents 26 to be received in the recess 24. The members 26 are provided at the opposite sides of the member 25 so that at each position of the bolt they engage in two of the recesses 24. It will also be apparent that the detents, being beveled or V-shaped in form and fitting into similarly-shaped recesses 24, they will act as cam members to yieldably hold the bolt against rotation. The detent member 25 may be urged to its forward or operative position by a spring 21 acting against a post 28 secured to the lock case,

It is desirable in devices of the character of the present one to provide means for dogging the bolt so that the door cannot be opened from the outside except by the use of a key. In the present instance, this is effected by providing a dogging member 30 movably mounted in the walls of the portion l3 of the lock case and provided with an actuating stem 3| extending through the inside knob rose 32 of the door adjacent the inside knob for manual operation. This dogging member 30 is provided with lugs 33, adapted to engage behind lugs 34 on guide legs 35 secured to the detent member 25 and, serving to guide this member in its movements, the legs 35 extend upon each side of the post 28 and are engaged bythelugs 33 rearwardly of this post. 7

When the stem 3| is in its outer position, the parts are in the position shown in Fig. 5 wherein the lug 34 is free to slide below the dogging lug 33 and the bolt is therefore not dogged. When, however, a person at the inside of the door wishes to dog the bolt, he merely pushes inwardly the member'3l, thus moving the dogging lug 33 into the path of the lug 34 and thus preventing movement of the detent member 25, also preventing rotation of the bolt by means of the engagement of the detents 26 in the recess 24.

The outside door knob shown at 48 is provided with a key-operated lock 4| having a stem 42 engaging in a non-circular opening in a hub 43 of a rollback 44, which rollback isdesigned to bear against and actuate a slide 45 against the actions of springs 46 which bear against this slide and against the rear of the case to normally urge the slide forwardly. This slide is provided with a pair of forwardly extending legs 41 each having its forward portion below the dogging member 38 and a beveled surface 48 designed to cooperate with an oppositely beveled surface 49 provided upon the dogging member 30. It will becbvious that, when the key plug of the lock is rotated and the hub 43 likewise rotated, the legs 41 of the slide 45 will be drawn rearwardly.

As may be seen from Fig. 5 and Fig. 6, if the dogging member 30 is pressed inwardly to its operative position, the beveled surface 49 will be moved into contact with the beveled surface 48 when the dogging lug 33 stands behind the lug 34 to dog the detent member 25 against movement. If it is desired to open the door. from the outside, proper key is inserted in the lock and the key plug 4| turned. The slide 45, including the legs one of the arms I1 is in engagement with the 41, will be moved rearwardly and the camming action of the beveled surfaces 48 on the beveled,

surfaces 49 will force the dogging member 30 outwardly to its inoperative position. The door may now be moved to open position by an outward pull upon the same. It will be understood that, in the present instance, neither of the door knobs is intended to be rotatable the door being both opened and closed by pressure applied thereto, no provision being made for rotation of the bolt except by engagement with the strike member 22.

It will also be seen from Fig; 4 that the legs 41 of the slide 45 are provided with shoulders 5| which lie rearwardly of the guiding legs 35 of the detent member 25. With this construction, it will be seen that the springs 48 also urge the detent member forwardly into engagement with the bolt and, if desired, the spring 21 may be omitted and the springs 46 may be of suflicient strength to move the detent member 25 forwardly as well as the slide 45.

In Figs. 9 and 10 of the drawings, we have shown a night latch of similar construction housed in a rim lock case to'be applied to the surface of the door rather than adapted for mortising in a door. In this case, the bolt portions l6 and I1, thedetent member 25, and spring 21 are the same as previously described in connection with the form shown in Figs. 1 to 8 of the drawings. In this case, the bolt is dead-locked by means of a dog 68 carried by a hub 6| rotatably mounted in the lock case, which hub is adapted to be turned by a stem 82. To the stem 62 may be connected a thumb turn (not shown) at the inside of the door, and, at the outside of the door, the stem may be connected to a key-operated look (not shown) In this case, the bolt is held in position in the manner previously described, namely, by means of 9. lug I8 provided on cover |4a of the case, this lug entering an annular recess I9 in the stem portion of the bolt. In order to hold the hub 6| yieldingly in its operative or inoperative position, a flat spring 63 is mounted in the case and adapted to engage a flatsided member 64 with sufficient force merely to prevent the hub 6| from accidentally swinging from one position to another.

' It will beseen that, in both forms of our invention, we have provided a night latch structure of simple and inexpensive construction and, at the same time, one which will be positive in operation and which may be mounted on the door either as a mortise lock or a rim lock witha minimum of effort.

While we have shown and described some preferred embodiments of our invention, it will be understood that it is not to be limited to all of the details shown but is capable of modification and variation within the spirit of the invention and within the scope of the appended claims.

What we claim is:

1. A night latch comprising a casing of generally tubular shape, a bolt mounted in the casing and having a portion projecting therefrom for engagement with a strike member by a rotary movement, means mounting said bolt in the easing for rotation about an axis parallel with the longitudinal axis of the casing, and means movable axially of the casing for yieldingly holding said bolt against rotation,

2. A night latch comprisinga casing ,of generally tubular shape, a bolt mounted in the casing and having a portion projecting therefrom for engagement with a strike member by a rotary movement, means mounting said bolt in the casing for rotation about an axis parallel with the longitudinal axis of the casing and'securing it against longitudinal movement, means for yieldingly holding said bolt against rotation, said means comprising a spring-pressed detent member adapted to engage the rear face of the bolt, and means to dog said detent member to lock the bolt against movement.

3. A door latch comprising a, casing, a bolt rotatably carried by the casing and projecting therefrom and adapted to be engaged with a strike by a. rotary movement, means-mounting said bolt in the casing for rotation about a horizontal axis perpendicular to the plane of the edge of the door from which it projects but securing it against movement longitudinally of the casing, and means engaging the rear face of the bolt for yieldingly holding said bolt in a. predetermined.

reciprocably mounted in the casing rearwardly of the bolt and spring-pressed into engagement with the rear face of the bolt.

5. A door latch comprising a casing, a bolt rotatably carried by the casing and projecting therefrom to be engaged with a strike by a rotary movement, means mounting said bolt inthe casing forrotatio-n about a horizontal axis perpendicular to the plane of the edge of the door from which it projects but securing it against longitudinal movement, and means for yieldingly holding said bolt in a predetermined position of rotation, said means comprising a detent member reciprocably mounted in the casing rearwardly of the bolt for movement longitudinally of the axis of rotation of the bolt, and the rear face of the bolt having a" recess therein to receive a part of said detent member.

6. A door latch comprising a casing, a bolt rotatably carried. by the casing and projecting therefrom to be engaged with a strike by a rotary movement, means mounting said bolt in the casing for rotation about a horizontal axis perpendicular to the plane of the edge of the door from which it projects but securing it against longitudinal movement, means for yieldingly holding. said bolt in a predetermined position of rotation,

said means comprising a spring-pressed detent member mouited in the casing rearwardly of the bolt and having a cam shaped detent thereon, said bolt having a recess to receive said detent.

'7. A door latch comprising a casing, a bolt rotatably carried by the casing and projecting therefrom to be engaged with a strike by a rotary movement, means mounting said bolt in the casing for rotation about a horizontal axis perpendicular to the plane of the edge of the door from which it projects but securing it against longitudinal movement, means for yieldingly holding said'bolt in a predetermined position of rotation, said means comprising a spring-pressed detent 'member mounted in the casing adjacent the rear end of the bolt and having a V-shaped detent at each of two opposite sides thereof adjacent the rear end of the bolt, and the rear face of the bolt having complementary-shaped recesses to receive said detent.

8. A door latch comprising a casing, a, bolt rotatably carried by the casing and projecting therefrom to be engaged with a strike by a rotary movement, means mounting said bolt in the casing for rotation about a horizontal axis perpendicular to the plane of the edge of the door from which it projects but securing it against longitudinal movement, means for. yieldingly holding said bolt in a predetermined position of rotation, said means comprising a spring-pressed detent member mounted in the casing rearwardly of the bolt, the rear face of the bolt having a recess therein to receive a part of the detent member, and a manually operable member accessible at the inside of the door to dog said detent member and lock the bolt against rotation.

9. A door latch comprising a casing, a bolt rotatably carried by the casing and projecting therefrom to be engaged with a strike by a rotary movement, means mounting said bolt in the casing for rotation about a horizontal axis perpendicular tothe plane of the edge of the door from which it projects but securing it against longitudinal movement, means for yieldingly holding said bolt in a predetermined position of rotation, said means comprising a detent member mounted in the casing rearwardly of the bolt and spring-pressed into engagement with the bolt, and a manually operable member reciprocably mounted in) the'casing, said member being movable to position to dog said detent member against movement.

10. A door latch comprising a casing, a bolt .rotatably carried by the casing and projecting therefrom to be engaged with a strike by arotary movement, means mounting said boltin the casing for rotation about a horizontal axis perpendicular to the plane of the edge of the door from member to its inoperative position and permit which it projects but securing it against longitudinal movement, means for yieldingly holding said bolt in a predetermined position of rotation, said means comprising a spring-pressed detent member mounted in the casing rearwardly of the bolt, the rear face of the bolt having a recess therein to receive a part of said detent member, a manually operable member accessible at the inside of the door to dog said detent member and lock the bolt against rotation, and key-operated means at the outside of the door to move said movement of the bolt.

HENRY G. VOIGHT. SAMUEL OXHANDLER. 

